Abstract: By summarizing and analyzing the types and characteristics of the landslide hazards to the oil and gas pipelines, the emergency treatment methods were developed, the key points and difficulties of the emergency landslide treatment of oil and gas pipelines were summarized, and it was also pointed out that constructing anti-slide piles was the most commonly method used in the emergency landslide treatment of pipelines in southwest mountainous areas. In order to cope with the difficulty of constructing hand digging piles as the anti-slide piles for emergency landslide treatment of the oil and gas pipelines, such as the excavation of boulders, blocks and bedrocks in the soil-rock mixed landslides, the miniaturized machinery based construction technology of circumferential rock cutting with water mill drill and centered rock drill-splitting was proposed, then the principle of water mill drill based excavation technology and the construction plan were clarified, and finally the engineering application for landslide treatment of Xishui Section of Zhongwei-Guiyang Gas Pipeline was introduced. As indicated in the engineering practice, the new technology has improved the construction efficiency greatly and shows higher social and economic benefits compared with the conventional excavation method with air pick. In addition, it was pointed out that a more efficient rock splitting method without affecting the stability of landslide mass should be developed urgently.